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Finding the Fourth Proportional to 85,838.72, 128,815.22 and 35,279.21

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Solution

The fourth proportional to 85,838.72, 128,815.22 and 35,279.21 is: 52,942.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,838.72 : 128,815.22 = 35,279.21 : x
  2. Step 2: Convert to fraction form
    85,838.72/128,815.22 = 35,279.21/x
  3. Step 3: Cross multiply
    85,838.72x = 128,815.22 × 35,279.21
  4. Step 4: Simplify right side
    85,838.72x = 4,544,498,377.10
  5. Step 5: Solve for x
    x = 4,544,498,377.10/85,838.72
  6. Step 6: Final answer
    x = 52,942.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.